Clear_Prop
If that turns out to be the case, 2+ hours of silence would at least clarify that whatever happened on this a/c all took place near to the point of deviation from the FPL RTE
No it would not clarify much.
It would give timing and subsequent probabilities.
1. Incapacitated crew do not talk
2. A lone crew member will likely not talk
3. A lone hijacker will likely not talk
The only thing you may obtain are sounds that someone in the cockpit was alive along with warning signals from the plane.